This module describes the status of Ontario’s transmission interfaces and interties which are key inputs for the resource adequacy and transmission assessments documented in the Annual Planning Outlook (APO).
The transmission interfaces generally represent a group of transmission circuits that separate each of the ten IESO electrical Zones (“IESO Zones”), or a boundary within an IESO Zone that creates a limit to the amount of power that can flow from one part of the province to another. The groups of transmission circuits which connect the IESO-controlled grid to neighbouring electrical systems are referred to as transmission interties (sometimes also referred to as “interconnections”)
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